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The Goodman 20201902 is a genuine OEM 23-inch condensate drain hose tube designed for GKS90703BXAF and compatible Goodman/Amana gas furnaces. This flexible tube routes acidic condensate away from the secondary heat exchanger and drain pan to the trap and disposal point, preventing water backup, pan overflow, and nuisance pressure-switch lockouts that occur when a cracked or clogged hose restricts flow.
The genuine OEM hose is molded to the exact length, bend radius, and inside diameter your furnace's drain system was engineered around, so it seats on the factory barbs without kinking. Generic aftermarket tubing is cheaper but often the wrong durometer or diameter, which can pop off under condensate load or collapse on a tight bend — a common cause of repeat water leaks. For a reliable, code-compliant repair we recommend the OEM part.
Easy (1 of 5). Typically a 10–15 minute swap: power down the furnace, disconnect the old hose from both barb fittings, route and press on the replacement, and verify a downhill slope to the trap. No special tools required. Always follow your unit's service manual and confirm the condensate trap is clear.